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Stock-Based Compensation - Valuation Assumptions (Details) - $ / shares
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Weighted average fair value of grants [1] $ 17.96 $ 24.77
Risk-free interest rate 1.36% 1.38%
Expected volatility 41.38% 43.50%
Expected life in years 4 years 6 months 17 days 4 years 6 months 21 days
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